SPARTA, Mich. (WZZM) -- A Sparta teenager is facing criminal charges for killing his girlfriend's dog.WZZM 13 obtained a copy of court records alleging Dylan Brooks, 17, had threatened his girlfriend and admitted to killing her dog. Brooks claims the miniature Chihuahua, named Athena, bit him and he killed it by twisting its neck.An examination, performed by animal control shows the dog suffered a severed spinal cord injury and a fractured spine.Brooks is charged with killing and torturing an animal and faces a maximum of four years in prison and $20,000 fine.